ABYC Diesel Practice Exam

What is the least likely cause of excessive water contaminated fuel when the operator uses various sources?

1. The fuel source is contaminated

2. Equipment wear and tear

3. Bad storage conditions

4. Poor filtration methods

The correct answer is: The fuel source is contaminated

When considering the options for causes of excessive water-contaminated fuel, the least likely cause, as indicated, is that the fuel source is contaminated. While it is indeed possible for a fuel source to contain contaminants, operators using various sources typically engage in practices that allow them to select cleaner or more reputable suppliers. In contrast, equipment wear and tear can contribute to water entering the fuel system. Over time, aging seals, gaskets, and other components might fail, leading to leaks where water can enter. Similarly, bad storage conditions, such as poor sealing of fuel tanks or exposure to elements, can introduce water into the fuel. Lastly, poor filtration methods can also result in water-contaminated fuel, as ineffective filtration may not remove water or particulates from the fuel, allowing them to enter the system. Thus, while contamination can indeed occur at the fuel source, the relation to operator behavior and source selection makes this the least likely cause in a scenario where various sources are being used.